Semiautomatic dial weighing mechanism



Sept. 28 1926. f v 1,601,459

' C. MCG. SYKES SEMAUTOMATIC DIAL WEIGHING MCHANISM Filed May 6. 1922 2 snetsneea 1 Sept. 28 1926.

C. MCG. SYKES SEMIAUTOMATIC DIAL WEIGHL'NG MECHANISM 2 Sheets-Sheet 2 Filed May G 192?,

Patented Sept. 28, 1926.

UNITED STATES PATENT OFFICE.

CAMERON MCGREGOR SYKES, 0F BIRMINGHAM, ENGLAND, ASSIG'NOR T0 W. c T. AVERY, LIMITED, 0F BIRMINGHAM, ENGLAND.

SEMIAUTOMATIC DIAL WEIGI-IING MECHANISM.

Application led May 6, 1922, Serial No. 558,989, and in Great Britain February 23, 1921.

This invention has reference to improvements in semi-automatic dial Weighing mechanism, and has for its object to simplify and improve mechanism of this character `whereby a more accurate Weight indication is obtained and a clearer indication of the Weights are visible on the dial. The present invention combines a steelyard and poise Weight mechanism With a dial indicator in such a manner that the minor weight is obtained by means of an index pointer moving over a dial and registering against Weight graduations thereon, and the major Weight is obtained by means of numerals on a steelyard, this numeral being read in conjunction with the indicated weight graduation on the dial.

The present invention consists of a semiautomatic dial Weighing mechanism ot' the character hereinbei'ore referred to, wherein the load applied to the machine is initially automatically balanced by a resistant, the load being subsequently transferred Without shock to the dial indicating mechanism as determined by the automatically controlled weight selection device. The present invention further resides in improvements in the details ot' construction and operation of the aforesaid mechanism as Will hereinafter more fully appear.

The present invention will now be` described in conjunction with the accompanying sheet of drawings Which illustrate as much of the Weighing Scale mechanism as is necessary to a complete understanding of the features comprisingr the present invention. In the drawings similar reference numerals indicate similar parts in the several views.

Fig. l is a front elevation to an enlarged scale of the steelyard and dial indicating mechanism in the position seen in Fig. 3 but with the dial and front cover' plate removed.

Fig. 2 is a part sectional end elevation of Fig. 1, and

Fig. 3 is a front elevation in outline of the pillar steclyard and automatic dial indicating mechanism.

The platform or Weighbridge to which the load is applied is connected in the ordinary manner to a connecting rod 4. This connecting rod is suspended by means of the link 5to the centre knife-edge of a lever 6,

the lever 6 is in turn suspended at the one end by means of links 7 from the back knife-edge S of the steelyard 9, and at its other end by means 0f the connecting rod 10 from a lever 11. The lever 11 is fulcrumed by means of a knife-edge on the bracket 12 mounted on the scale housing and has at its other end a toothed segment 13 meshing With a pinion 1st mounted on a spindle 15 on the bracket 12. Secured to the spindle 15 is the index pointer 16 which indicates against the numerals on the small dial 17 for a purpose which will be hereinafter described. The lever 11 is connected by means of a link to the coil spring 18 which is suspended at its other end i'rom the rod 19 mounted in the dial housing 20. The spring 10 forms the automatic resistant for any load which is applied to the Weighing platform Within the capacity of the scale and serves to determine the positioning of the poise Weight 21 upon the steelyard 9 as Will be explained later. The steelyard 9 is fulcrumed by the knifeedge 9n upon the bearings 22 mounted in the head of the pillar 23 Within Which the stcelyard is located. Projecting from the rear tace of the steelyard 9 is a horizontal pin 21 to which is connected the vertical rod 25 Which in turn is suspended from the one arm of a lever 26 which is tulcrumed on the bracket 27 mounted on the base of the dial housing 20. Connected to the other arm oit this lever 26 is a dashpot or motion steadying device 28 and the extremity of this arm o't' the lever is connected by means of a knife-edge 29 With a Weight 30 which is formed integral with the link 31. The link 31 is in turn dependent by means of the link 32 from a lever which is ulcrumed by means of a knife-edge 84e on the bracket 3.3 secured to the side ot' the dial housing 20. This lever 33 is suspended at its outer end from the links 36 the upper one of Which is mounted on a central knife-edge of a yoke 37 which has connection at both ends by means of flexible nickcled steel ribbons 38 to the cams 39 to which are secured the over- Weighted pendulous resistant Weights 40 which form the automatic Weighing resistance vfor the minor order of Weighment. The cams and pendulums are mounted by means of knife-edges 41 upon bearings L12 in the cross bars 43 forming part of the dial L'LO housing Q0. Pirotally mounted on the yoke 37 is a Weighted rack Llll which meshes with a pinion il5 mounted on a` spindle 16, and connected to the spindle is the inde?L tinger il? Which automatically indicates the minor order ot Weighment.

The major order ol neielinient is indicated by means ot the graduations on the steelyard 9 according` to the position ot' the poise Weight 2l the poise weight being located in the ordinarjv manner bjf means ot the nib 49 which is adapted to be located in aniv one ot the notches 50 ot the steelyard 9. The tree end ot' the lona` arm oit the steel- Yard 9 is located Within an end aperture `iu the bracket 5l and has limited motion therein determined by the stops 52; this. steelyard can be locked in position Within the bracle 5l by means oit the tumbler The operation ot the scale is as tollons: Upon application oit a load to the Weighing platform the Weight is transmitted through the connecting rod l; to the lever G and is simultaueousl;7 distributed by this lever to the steelyard and to the spi-inc, the poise weight beine' at the Zero position. the steelliard 9 nowrises at the tree end ot the lone arm to contact with the top stop` and it the load exceeds one hundred nf'eie'ht the index pointer Llf? traverses the Whole course ot the minor orders Weight dial and is located out ot vision behind the shutter The short arm ot the steeljvard 9 has non7 tellen to its tull limit and the leute-edge 8 now forms a fixed point ot suspension :For the lett hand end ot the lever G. In consequence the load on the Weighing platform is Wholly transmitted through the connecting rod l0, lever ll to the coil spring- 1S which terms the rough or approximate automatic Weighing resistant for the Whole ot the load Within the total capacita7 ot the scale. The load has nonv extended the coil springr l? an amount equivalent to that ot the load and has imparted a rotaryY motion to the toothed segment 13 at the lett han-d end ot the lerer ll. consequentlyr rotating' the pinion le and meting' the index pointer 16 around the tace ot the small dial 17. This dial is provided with a series ot numerals against which the pointer 1G is adapted to register and in accordance with the posit-ion indicated bf; this pointer 16 the poise n'eieht 2l is manna-lli positioned upon the` steelyard 9. For in stance. by reference to Fing. 3 ot the dran'- inejs. the pointer i6 is nidieatinef against the numeral 6 on the dial l? and accordingly the poise Weight 2l has been traversed along the steelyard to the numeral 6 indicating one cirt. The balance ot the veieht to complete the Weighingis automatically obta'ned by means ot the pendulous resistance fl-O as will nonY be described. The pendulons Weights 40 are equal to the VWeight between anytwo notches ot the steelyard in the oase under review one cwt., so that by mov ing the poise Weight Q1 to indicate six cn't., the steelyard is brouieht to the central position between the limiting stops in the aperture ot the bracket 5l and the balance ot the load to complete the weighinent is now transmitted through the lett hand arm ot the lever G and links 7, steelyard 9. piu 24, rod 25, lever Q6. links 3l, and lever 33, links 3G, yoke 37, flexible ribbons 38, cam 39 to the pendulums 40. This minor part of the load causes the pendulums to swine t0- nard each other and automatiealhT counterbalance the remainder ot the load over and above the major amount ot six cwt. movement ot' the pendulums 'lO through their connections to the Yoke 3T has caused the rack dllto rotate the pinion 45 and trarerse the index pointer 47 across the minor Weight divisions on the large dial 54 until the position oit balance is obtained and the complete nfeiehment is nonr completed, as to the major order by means ot' the indicated numeral t8 on the steelyard 9, and as to the minor order by means ot the pointer sti' in relation to the graduations on the dial 54,

A scale indicating mechanisn'i constructed and operated as herein described lYields very accurate ireiglnnent for loads ot a large capacitaT and a clear indication of the Weighment`r the minor order of Weighment being indicated to a` liner degree than obtains with dial mechanism wherein the whole ot' both orders of Weighmeut are indicated upon the one dial.

By the emliodinient ot' the automatic initial Weight selection device in the mechanism a very considerable savingr ot time is etiected in niaking u'eiejhments with the apparatus; and as it onlyY necessary to graduate the dial with the minor order oit weighments a much lgreater distance can be obtained between each graduation than obtains in the case ot dial Weighing mechanism where the itull load has to be marked. thereon.

1. A Weighing mechanism comprising in combination a steelyard and a poise Weight mechanism mounted thereon forming a nonautomatic resistant, an automatic resistant which initiallyv balances the load applied to the mechanism, a dial indicator operated by said automatic resistant, a peudulous resistant connected to the said steelyard for automaticall;v counterbalaneing the minor order of Weighment, and means whereby the load acts independently upon both the said automatic and the non-au'ton'iatic resistants.

Q. A semi-automatic Weight indicating mechanism, comprising in combination an automatic resistant tor initially connterbalaneino the load, an indicator operated in consonance with said resistant, a steelyard and poise Weight mechanism for connterbalanciner and indicating the major order of This ily)

Weighment forming a non-automatic resistant, an overweighted pendulous mechanism connected to the said steelyard for automatically countei'balancing the minor order of weighment, mechanism controlled by said pendulous iesistant for automatically indicating the minor order of Weighment, and

means whereby the load acts independently upon both the said automatic and the nonautomatic resistants.

In testimony whereof, I have signed my name to this specification.

CAMERON MGGREGOR SYKES. 

